Exterior lighting fixture depicting a blue heron



FIG. 1 is a side view of the exterior lighting fixture depicting the blue heron;

FIG. 2 is a front view of the lighting fixture depicted in FIG. 1;

FIG. 3 is a rear view of the lighting fixture depicted in FIG. 1; and,

FIG. 4 is a view of the lighting fixture of FIG. 3 from a perspective looking up from the ground.

The broken lines are for illustrative disclosure and form no part of the claimed design. 

The ornamental design for exterior lighting fixture depicting a blue heron, as shown and described. 